54 



STATE BOARD OF FORESTRY. 



(a) The determination of the average value of 

 (?/: -f- c -f k) (t 6 -j- ) - 



-] 



(to-j-c + jb) (r+fr-|-t) 



For 1" X 3" lumber cut 1 1/16" X 3 1/8" 

 w = 3, c = 1/8 = .125, k = 1/8 = .125 

 # = 1, 6 = 1/16 = .0625 

 ( w 4- c 4- &) = 3. + .125 + .125 = 3.25 

 (t + & -f fc)= 1 -f .062 + .125 = 1.187 

 (w + c + ft) (f + 1) + k) = 3.25 X 1-187 = 3.86 

 wf = 1 X 3 = 3 



q On q 



Then (^) = 1- ' = 1 - .223 = .777 



o.ob 



Therefore 150,000 bd. ft. represents 77.7% of the original material, 

 or 22.3% has been forfeited to sawdust, shrinkage and surfacing in 

 manufacturing 1" X 3" lumber, cut 1 1/16" X 3' 1/8" when saw kerf 

 = 1/8" 



150,000 



=193,000 = the volume in bd. ft. of material actually used 



in producing 150,000 bd. ft. of 1" X 3" lumber (not including slabs 

 and edgings). 



With simliar determinations made for all other dimensions of lumber 

 cut, we have: 



not including the wastage necessary for slabs and edgings. 



